From 63617a2d2df02054d9d55b2aa2dd56249339fdf1 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20H=C3=A4rdeman?= <david@hardeman.nu>
Date: Sun, 5 Oct 2025 17:32:52 +0200
Subject: [PATCH] odhcpd: print compiled-in features in help message
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This is mostly useful for hacking, as a way to quickly determine from the command-line
how odhcpd has been built. But I also plan to use it in LuCI [1].

[1] https://github.com/openwrt/luci/blob/master/modules/luci-base/root/usr/share/rpcd/ucode/luci

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/268
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
 src/odhcpd.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/odhcpd.c b/src/odhcpd.c
index 1cab203..9bb9ddc 100644
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -55,6 +55,23 @@ static void sighandler(_unused int signal)
 static void print_usage(const char *app)
 {
 	printf("== %s Usage ==\n"
+	       "Features: ra ndp dhcpv6"
+#ifdef DHCPV4_SUPPORT
+	       " dhcpv4"
+#else
+	       " no-dhcpv4"
+#endif /* DHCPV4_SUPPORT */
+#ifdef UBUS
+	       " ubus"
+#else
+	       " no-ubus"
+#endif /* UBUS */
+#ifdef EXT_CER_ID
+	       " cer"
+#else
+	       " no-cer"
+#endif /* EXT_CER_ID */
+	       "\n"
 	       "\n"
 	       "	-c <path>	Use an alternative configuration file\n"
 	       "	-l <int>	Specify log level 0..7 (default %d)\n"
-- 
2.30.2